title: Self-assembled poly(N-methylaniline)-lignosulfonate spheres: from silver-ion adsorbent to antimicrobial material.
abstract: Self-assembled poly(N-methylaniline)-lignosulfonate (PNMA-LS) composite spheres with reactive silver-ion adsorbability were prepared from N-methylaniline by using lignosulfonate (LS) as a dispersant. The results show that the PNMA-LS composite consisted of spheres with good size distribution and an average diameter of 1.03-1.27 μm, and the spheres were assembled by their final nanofibers with an average diameter of 19-34 nm. The PNMA-LS composite spheres exhibit excellent silver-ion adsorption; the maximum adsorption capacity of silver ions is up to 2.16 g g(-1) at an adsorption temperature of 308 K. TEM and wide-angle X-ray results of the PNMA-LS composite spheres after absorption of silver ions show that silver ions are reduced to silver nanoparticles with a mean diameter of about 11.2 nm through a redox reaction between the PNMA-LS composite and the silver ions. The main adsorption mechanism between the PNMA-LS composite and the silver ions is chelation and redox adsorption. In particular, a ternary PNMA-LS-Ag composite achieved by using the reducing reaction between PNMA-LS composite spheres and silver ions can be used as an antibacterial material with high bactericidal rate of 99.95 and 99.99% for Escherichia coli and Staphylococcus aureus cells, respectively.
authors.affiliation: College of Materials Science and Engineering, Fuzhou University, 2 Xueyuan Road, Fuzhou 350116, P.R. China. qiufenglv@163.com
authors.forename: Qiu-Feng
authors.initials: QF
authors.lastname: Lü
authors.forename: Jia-Yin
authors.initials: JY
authors.lastname: Zhang
authors.forename: Jun
authors.initials: J
authors.lastname: Yang
authors.forename: Zhi-Wei
authors.initials: ZW
authors.lastname: He
authors.forename: Chang-Qing
authors.initials: CQ
authors.lastname: Fang
authors.forename: Qilang
authors.initials: Q
authors.lastname: Lin
mesh_terms: D000327:Adsorption; D000814:Aniline Compounds / Q000737:chemistry*; D000900:Anti-Bacterial Agents / Q000737:chemistry* / Q000494:pharmacology; D004926:Escherichia coli / Q000187:drug effects; D007477:Ions / Q000737:chemistry; D008031:Lignin / Q000031:analogs & derivatives* / Q000737:chemistry; D057139:Nanofibers / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013211:Staphylococcus aureus / Q000187:drug effects
chemical_list: D000814:Aniline Compounds; D000900:Anti-Bacterial Agents; D007477:Ions; D011108:Polymers; D012834:Silver; C001545:lignosulfuric acid; D008031:Lignin; C021313:methylaniline
keywords: adsorption; lignosulfonate; polymerization; self-assembly; silver